Dynamic torque calibration device for electric and pneumatic torque wrenches
By designing a dynamic torque measurement module and a bolt simulation device, the problems of impact force and misalignment error in the calibration of electric and pneumatic torque wrenches were solved, achieving high-precision and efficient calibration results.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SHANGHAI SHIGE TESTING TECH CO LTD
- Filing Date
- 2025-05-26
- Publication Date
- 2026-05-12
AI Technical Summary
Existing torque wrench calibration devices are mainly suitable for static torque calibration of conventional manual torque wrenches. The torque of electric and pneumatic torque wrenches is dynamic, and there are measurement errors caused by electric and pneumatic impact forces and misalignment during the calibration process, making it difficult to achieve high-precision calibration.
A dynamic torque calibration device for electric and pneumatic torque wrenches was designed. It adopts a dynamic torque measurement module and a unique bolt simulation device. The device uses a butterfly spring assembly and retaining ring to buffer and absorb vibration. Combined with a high-precision torque sensor and measurement circuit, it can achieve dynamic torque calibration of electric and pneumatic torque wrenches.
It improves the calibration accuracy and efficiency of electric and pneumatic torque wrenches, simplifies the calibration process, is applicable to electric and pneumatic torque wrenches of various specifications and accuracy requirements, and reduces impact force and misalignment errors during the calibration process.
Smart Images
Figure CN224231164U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to torque wrench technical field especially relates to a kind of dynamic torque calibration device of electric and pneumatic torque wrench. BACKGROUND
[0002] With the increasing of industrial intelligent level, electric torque wrench and pneumatic torque wrench are increasingly popular for accurate control bolt tightening torque, improve the quality and reliability of product.
[0003] However, the calibration device and method of existing torque wrench are generally applicable to the calibration of static torque of conventional manual torque wrench, while the torque of electric and pneumatic torque wrench is dynamic, gradually increasing from 0 to maximum, and there is measurement error caused by electric and pneumatic impact force and misalignment in calibration process, to improve calibration accuracy.
[0004] Therefore, it is urgent to develop an efficient and accurate dynamic torque calibration device suitable for electric and pneumatic torque wrench. UTILITY MODEL CONTENTS
[0005] The utility model aims at solving the shortcomings of calibration device and method of torque wrench in prior art, which are generally applicable to the calibration of static torque of conventional manual torque wrench, while the torque of electric and pneumatic torque wrench is dynamic, gradually increasing from 0 to maximum, and there is measurement error caused by electric and pneumatic impact force and misalignment in calibration process, to improve calibration accuracy, and proposes a kind of dynamic torque calibration device of electric and pneumatic torque wrench.
[0006] To achieve the above-mentioned purpose, the utility model adopts the following technical scheme:
[0007] A kind of dynamic torque calibration device of electric and pneumatic torque wrench, including base, its top side is fixedly connected sensor fixed support, the sensor fixed support is fastened torque sensor by bolt;The middle position of the top of the base is welded with intermediate support, and the other side of the top is fixedly connected with outer spherical bearing seat by bolt;
[0008] Bolt nut torque connection simulator, it is installed in the inside of the intermediate support by bearing rotation through the outer spherical bearing seat, one end of the bolt nut torque connection simulator is rigidly connected with the input end of the torque sensor;
[0009] Adjusting cross plate is slidably connected with T-shaped groove in the bottom of the base by T-shaped block;
[0010] A support assembly comprises a sliding vertical plate, which forms a moving pair with a sliding groove opened at the end of the adjusting horizontal plate through a sliding block, a support block welded at the top of the sliding vertical plate, an arc-shaped hole opened at the top of the support block and matched with the outer diameter of the handle of the electric torque wrench, and a compression spring installed between the bottom of the support block and the top of the side limiting block fixed to the end face of the adjusting horizontal plate;
[0011] An adjusting assembly comprises a fixed plate welded to the bottom of the base, a adjusting screw rod penetrating through the center of the fixed plate, and an operating block welded to one end of the adjusting screw rod and matched with the internal threaded hole of the end of the adjusting horizontal plate;
[0012] The bolt-nut torque connection simulator comprises a connection simulator main body, a bolt simulator threadedly connected to one end of the connection simulator main body, an annular groove opened in the inside of the connection simulator main body, and a clasp ring arranged in the annular groove, a set of butterfly-shaped springs installed between the clasp ring and the bottom face of the groove in the circumferential direction, and a tapered face of the end face of the clasp ring matched with a tapered face of the end of the bolt simulator.
[0013] The base is welded with four supporting legs at the four corners of the bottom face.
[0014] In operation, the output end of the electric torque wrench is inserted into the bolt simulator, the compression spring pushes the support block to make the arc-shaped hole closely contact with the handle of the wrench, the torque is transmitted to the torque sensor after being buffered by the set of butterfly-shaped springs, and the torque sensor converts the dynamic torque signal into an electric signal for output.
[0015] In a possible design, the support block is in elastic contact with the handle of the electric torque wrench through the elastic force of the compression spring, and the elastic contact pressure ranges from 50 N to 200 N.
[0016] In a possible design, the adjusting screw rod adopts a trapezoidal thread structure, the lead of the trapezoidal thread structure ranges from 2 mm to 4 mm, and the operating block is rotated to drive the adjusting horizontal plate to move horizontally, and the moving precision is 0.05 mm.
[0017] In a possible design, the set of butterfly-shaped springs is composed of 3 to 5 butterfly-shaped springs, and the stiffness of the set of butterfly-shaped springs ranges from 100 N / mm to 500 N / mm, which is used to absorb the impact vibration generated in the calibration process.
[0018] In a possible design, an axial gap ranging from 0.1 mm to 0.3 mm is arranged between the clasp ring and the bottom face of the groove of the connection simulator main body, and the axial gap is used to compensate for the axial misalignment error of the electric torque wrench and the bolt simulator.
[0019] In a possible design, the torque sensor has a range of 10 N·m to 1000 N·m, an accuracy level of 0.1 level, and a response frequency of not less than 1000 Hz.
[0020] In a possible design, the arc-shaped hole surface of the support block is sprayed with a wear-resistant coating, which is a tungsten carbide-based composite material with a hardness not less than HRA85.
[0021] In a possible design, the base is of an integral cast iron structure, the bottom surface of which has a flatness error of not more than 0.02 mm, and the bottom of the support leg is provided with an adjustable foot bolt, the adjustment range of which is ±5 mm.
[0022] In a possible design, the device is adapted to electric / pneumatic torque wrenches with diameters of 20-50 mm by replacing different specifications of the bolt simulator, and the thread specifications of the bolt simulator cover M6-M20.
[0023] In the present application, each dynamic torque wrench in the assembly line is calibrated by moving the device to a suitable position, the electric torque wrench is inserted into the inside of the bolt and nut torque connection simulator, and cooperates with the bolt simulator, the device has strong shock absorption capacity due to the arrangement of the butterfly spring group and the snap ring, and the device protects the equipment and parts, the bolt and nut torque connection simulator and the torque sensor are used to measure various parameters of the electric and pneumatic torque wrenches, such as torque value and angle value. The module uses high-precision dynamic torque sensors and measurement circuits, which can quickly and accurately measure dynamic torque. The measurement range and accuracy can also be adjusted as needed to meet the calibration requirements of electric and pneumatic torque wrenches of different specifications and accuracy requirements.
[0024] In actual use, in order to ensure the stability of the electric torque wrench, the support block can also be pushed upward by the elastic force of the compression spring, so that the arc-shaped hole is in contact with the electric torque wrench, thereby improving the stability of the device during measurement, and the sliding vertical plate drives the sliding block to move in the sliding groove, ensuring the stability of the sliding vertical plate.
[0025] In order to adapt to different shapes of electric torque wrenches, the horizontal position of the support block can also be adjusted, the operating block is rotated, the operating block drives the adjusting screw rod to rotate, the adjusting screw rod drives the adjusting horizontal plate to move horizontally, the arrangement of the T-shaped block and the T-shaped groove can ensure the stable movement of the adjusting horizontal plate, and then the adjusting horizontal plate drives the support block to move horizontally, thereby adjusting the horizontal position of the support block to better adapt to the electric torque wrench and ensure the stability of the electric torque wrench.
[0026] Beneficial effects: A dynamic torque calibration device for electric and pneumatic torque wrenches is suitable for horizontal operation of electric and pneumatic torque wrenches, which is different from the common vertical operation method. Due to the weight and large volume of electric and pneumatic torque wrenches, the vertical operation method is very inconvenient, and the horizontal operation is more in line with the work requirements.
[0027] By the design of automation and intelligence, and with the counter-force arm, the calibration process is greatly simplified, and the calibration accuracy and efficiency of the electric and pneumatic torque wrench are improved. Meanwhile, the device has a wide range of applications, and can be widely applied to the calibration of various electric and pneumatic torque wrenches. BRIEF DESCRIPTION OF DRAWINGS
[0028] Figure 1 A three-dimensional structural schematic view of a dynamic torque calibration device for an electric and pneumatic torque wrench is provided in the utility model;
[0029] Figure 2 A three-dimensional structural schematic view of a dynamic torque calibration device for an electric and pneumatic torque wrench is provided in the utility model;
[0030] Figure 3 An exploded view of an adjusting cross plate and a supporting block in a dynamic torque calibration device for an electric and pneumatic torque wrench is provided in the utility model;
[0031] Figure 4 A three-dimensional sectional view structural schematic view of a bolt and nut torque connection simulator in a dynamic torque calibration device for an electric and pneumatic torque wrench is provided in the utility model.
[0032] In the figure: 1, electric torque wrench; 2, outer spherical bearing seat; 3, bolt and nut torque connection simulator; 301, connection simulator main body; 302, butterfly spring group; 303, clasp ring; 304, bolt simulator; 4, intermediate support; 5, torque sensor; 6, sensor fixed support; 7, base; 8, supporting leg; 9, adjusting cross plate; 10, side limit block; 11, supporting block; 12, T-shaped groove; 13, operating block; 14, fixed plate; 15, adjusting screw; 16, sliding vertical plate; 17, arc-shaped hole; 18, sliding groove; 19, T-shaped block; 20, compression spring; 21, sliding block. DETAILED DESCRIPTION
[0033] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments.
[0034] In view of the deficiencies of the existing static torque calibration technology, the utility model provides a dynamic torque calibration device for an electric and pneumatic torque wrench, adopts a dynamic torque measurement module, and simulates the bolt tightening process through a unique bolt simulation device, greatly reduces the measurement errors caused by the impact force and misalignment of the electric and pneumatic torque wrenches in the calibration process, and improves the calibration accuracy and efficiency through the advanced measurement technology and unique structure design.
[0035] Embodiment 1; refer toFigures 1-4 The specific implementation of a dynamic torque calibration device for electric and pneumatic torque wrenches is as follows:
[0036] The main body of the device consists of a base 7 and an electric torque wrench 1. A sensor mounting bracket 6 is welded to one side of the top of the base 7, and the torque sensor 5 is fastened to the side of the sensor mounting bracket 6 with bolts. An intermediate support 4 is welded to the middle of the top of the base 7, and an outer spherical bearing seat 2 is fixed to the other side of the top with bolts. A torque connection simulator 3 is installed inside the outer spherical bearing seat 2 with bolts and nuts. One end of the simulator is rotatably mounted inside the intermediate support 4 via a bearing, and the other end is rigidly connected to the input end of the torque sensor 5 via a coupling.
[0037] An adjusting horizontal plate 9 is installed at the bottom of the base 7, which slides through the cooperation of a T-slot 12 and a T-block 19. A support assembly is installed at one end of the adjusting horizontal plate 9: a sliding groove 18 is machined at the end of the adjusting horizontal plate 9, and a sliding block 21 is welded to the bottom of the sliding vertical plate 16 and embedded in the sliding groove 18 to form a sliding pair. Side limiting blocks 10 are installed on both sides of the sliding vertical plate 16 and are fixed to the end face of the adjusting horizontal plate 9 by bolts. A support block 11 is welded to the top of the sliding vertical plate 16, and an arc-shaped hole 17 is opened on the upper surface of the support block 11. The radius of curvature of the arc-shaped hole 17 matches the outer diameter of the handle of the electric torque wrench 1. A compression spring 20 is installed between the bottom of the support block 11 and the top of the side limiting block 10, and the two ends of the spring are fixed by welding.
[0038] An adjustment assembly is installed at the bottom of the base 7: a fixing plate 14 is welded to the bottom surface of the base 7, a threaded hole is machined in the center of the fixing plate 14 and an adjusting screw 15 is inserted through it. The end of the adjusting screw 15 is machined with an external thread to mate with the internal threaded hole machined at the end of the adjusting horizontal plate 9, and an operating block 13 is welded to the end of the screw. A T-shaped block 19 is welded to the top surface of the adjusting horizontal plate 9, and a T-shaped groove 12 is machined at the corresponding position on the bottom surface of the base 7 to achieve guiding and limiting through the T-shaped structure.
[0039] The bolt and nut torque connection simulator 3 consists of a connection simulator body 301, with an internally threaded hole machined at one end of the body and screwed into the bolt simulator 304. An annular groove is formed inside the connection simulator body 301, and a retaining ring 303 is placed within the groove to form a sliding pair. A set of butterfly springs 302 is evenly distributed circumferentially between the retaining ring 303 and the bottom surface of the groove; each spring set consists of multiple stacked butterfly springs. The end face of the retaining ring 303 is machined with a tapered surface to mate with the tapered surface at the end of the bolt simulator 304, achieving axial positioning through spring preload.
[0040] The base 7 has four welded support legs 8 at its bottom corners to form a stable support structure. In actual use, the device is placed on a calibration platform and leveled using the support legs 8. The output end of the electric torque wrench 1 is inserted into the end of the bolt simulator 304 of the bolt and nut torque connection simulator 3, so that the wrench head contacts the conical surface of the retaining ring 303. Rotating the operating block 13 drives the adjusting screw 15 to rotate, causing the adjusting plate 9 to move laterally along the T-slot 12, adjusting the horizontal position of the support block 11. The compression spring 20 pushes the support block 11 upward, so that the arc-shaped hole 17 fits tightly with the wrench handle. After the wrench is started, the torque is transmitted to the torque sensor 5 through the bolt simulator 304 and buffered by the butterfly spring group 302. The sensor converts the dynamic torque signal into an electrical signal output.
[0041] When calibrating different sizes of wrenches, the corresponding bolt simulator 304 can be replaced, and the position of the support block 11 can be adjusted by adjusting the lead screw 15. The disc spring assembly 302 absorbs the impact vibration during the calibration process, and the retaining ring 303 floats axially within the groove to compensate for misalignment errors. The compression spring 20 always maintains the contact pressure between the support block 11 and the wrench handle, ensuring the stability of the calibration process. Through modular design, this device can be adapted to various electric / pneumatic torque wrenches in the diameter range of 20-50mm, with a measurement error ≤±0.5%FS and a repeatability accuracy better than 0.2%.
[0042] However, as is well known to those skilled in the art, the working principle and wiring method of torque sensor 5 are commonplace and are all conventional methods or common knowledge. The torque sensor 5 is selected from the T40FM series digital torque sensor of HBM Company, which will not be described in detail here. Those skilled in the art can make any selection according to their needs or convenience.
[0043] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.
Claims
1. A dynamic torque calibration device for electric and pneumatic torque wrenches, characterized in that, include: The base (7) has a sensor fixing support (6) fixed to one side of its top, and the sensor fixing support (6) is fastened to the torque sensor (5) by bolts; the base (7) has an intermediate support (4) welded to the middle position of its top, and an outer spherical bearing seat (2) fixed to the other side of its top by bolts. The bolt and nut torque connection simulator (3) passes through the outer spherical bearing seat (2) and is rotatably installed inside the intermediate support (4) through the bearing. One end of the bolt and nut torque connection simulator (3) is rigidly connected to the input end of the torque sensor (5). Adjust the horizontal plate (9), which is slidably connected to the T-slot (12) at the bottom of the base (7) via the T-block (19); The support assembly includes a sliding vertical plate (16), which forms a sliding pair with the sliding groove (18) at the end of the adjusting horizontal plate (9) through a slider (21). A support block (11) is welded to the top of the sliding vertical plate (16). An arc-shaped hole (17) matching the outer diameter of the handle of the electric torque wrench (1) is opened on the top of the support block (11). A compression spring (20) is installed between the bottom of the support block (11) and the top of the side limiting block (10) fixed to the end face of the adjusting horizontal plate (9). The adjustment assembly includes a fixing plate (14) welded to the bottom of the base (7), an adjustment screw (15) passing through the center of the fixing plate (14), one end of the adjustment screw (15) engaging with the internal threaded hole at the end of the adjustment cross plate (9), and the other end being welded to an operating block (13).
2. The dynamic torque calibration device for electric and pneumatic torque wrenches according to claim 1, characterized in that, The bolt and nut torque connection simulator (3) includes a connection simulator body (301), one end of which is threaded to a bolt simulator (304). An annular groove is opened inside and a retaining ring (303) is provided. A butterfly spring assembly (302) is evenly distributed circumferentially between the retaining ring (303) and the bottom surface of the groove. The tapered surface of the end face of the retaining ring (303) is engaged with the tapered surface of the end face of the bolt simulator (304). During operation, the output end of the electric torque wrench (1) is inserted into the bolt simulator (304), and the compression spring (20) pushes the support block (11) to make the arc hole (17) fit tightly with the wrench handle. The torque is buffered by the butterfly spring group (302) and then transmitted to the torque sensor (5). The torque sensor (5) converts the dynamic torque signal into an electrical signal output.
3. The dynamic torque calibration device for electric and pneumatic torque wrenches according to claim 2, characterized in that, The support block (11) achieves elastic contact with the handle of the electric torque wrench (1) through the elastic force of the compression spring (20), and the elastic contact pressure range is 50N to 3000N, with the measurement range adjustable.
4. The dynamic torque calibration device for electric and pneumatic torque wrenches according to claim 2 or 3, characterized in that, The adjusting screw (15) adopts a trapezoidal thread structure with a lead of 2mm to 4mm. Rotating the operating block (13) can drive the adjusting plate (9) to move laterally with a moving accuracy of 0.05mm.
5. The dynamic torque calibration device for electric and pneumatic torque wrenches according to any one of claims 2 to 3, characterized in that, The butterfly spring assembly (302) is composed of 3 to 5 butterfly springs stacked together, and the stiffness of the butterfly spring assembly (302) ranges from 100 N / mm to 500 N / mm, and is used to absorb the impact vibration generated during the calibration process.
6. The dynamic torque calibration device for electric and pneumatic torque wrenches according to claim 4, characterized in that, An axial gap of 0.1 mm to 0.3 mm is provided between the retaining ring (303) and the bottom surface of the groove of the connecting simulator body (301). The axial gap is used to compensate for the axial misalignment error between the electric torque wrench (1) and the bolt simulator (304).
7. The dynamic torque calibration device for electric and pneumatic torque wrenches according to any one of claims 1 to 3, characterized in that, The torque sensor (5) has a range of 10 N·m to 1000 N·m, an accuracy class of 0.1, and a response frequency of not less than 1000 Hz.
8. The dynamic torque calibration device for electric and pneumatic torque wrenches according to any one of claims 1 to 3, characterized in that, The surface of the arc-shaped hole (17) of the support block (11) is coated with a wear-resistant coating, which is a tungsten carbide-based composite material.
9. The dynamic torque calibration device for electric and pneumatic torque wrenches according to any one of claims 1 to 3, characterized in that, The base (7) has four legs (8) welded to its bottom. The base (7) is an integral cast iron structure with a bottom surface flatness error of no more than 0.02 mm. The bottom of the legs (8) is provided with adjustable anchor bolts with an adjustment range of ±5 mm.